Hydromedusa

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Hydromedusa

 

(1) A genus of the Rhynchocephalia family of snake-necked tortoises. It is characterized by a very long neck (which exceeds the length of the dorsal shell) and by the presence of four claws on each of the front legs. The length of the carapace does not exceed 30 cm. There are two species, both freshwater and native to South America. Hy-dromedusa lays its eggs on the shores of inland bodies of water.

(2) Medusoid individuals of certain coelenterates of class Hydrozoa.

References in periodicals archive ?
The nematocyte complex in a hydromedusan, Gonionemus vertens.
The radial muscle of the hydromedusan velum allows direct control of the shape of the nozzle during fluid ejection, and therefore direct control of turning.
that give rise to the long posterior cilia are similar in structure to the simple photoreceptors described in the hydromedusan Leuckartiara octona (Singla, 1974) and to sensory cells that may be photoreceptors in the planulae of Hydractinia echinata (Thomas et al.